tools/perf/tests/open-syscall.c

   1 #include "thread_map.h"
   2 #include "evsel.h"
   3 #include "debug.h"
   4 #include "tests.h"
   5
   6 int test__open_syscall_event(void)
   7 {
   8         int err = -1, fd;
   9         struct perf_evsel *evsel;
  10         unsigned int nr_open_calls = 111, i;
  11         struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
  12
  13         if (threads == NULL) {
  14                 pr_debug("thread_map__new\n");
  15                 return -1;
  16         }
  17
  18         evsel = perf_evsel__newtp("syscalls", "sys_enter_open", 0);
  19         if (evsel == NULL) {
  20                 pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
  21                 goto out_thread_map_delete;
  22         }
  23
  24         if (perf_evsel__open_per_thread(evsel, threads) < 0) {
  25                 pr_debug("failed to open counter: %s, "
  26                          "tweak /proc/sys/kernel/perf_event_paranoid?\n",
  27                          strerror(errno));
  28                 goto out_evsel_delete;
  29         }
  30
  31         for (i = 0; i < nr_open_calls; ++i) {
  32                 fd = open("/etc/passwd", O_RDONLY);
  33                 close(fd);
  34         }
  35
  36         if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
  37                 pr_debug("perf_evsel__read_on_cpu\n");
  38                 goto out_close_fd;
  39         }
  40
  41         if (evsel->counts->cpu[0].val != nr_open_calls) {
  42                 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
  43                          nr_open_calls, evsel->counts->cpu[0].val);
  44                 goto out_close_fd;
  45         }
  46
  47         err = 0;
  48 out_close_fd:
  49         perf_evsel__close_fd(evsel, 1, threads->nr);
  50 out_evsel_delete:
  51         perf_evsel__delete(evsel);
  52 out_thread_map_delete:
  53         thread_map__delete(threads);
  54         return err;
  55 }